Haha, there are a couple of places on the GH60 that are messy, that's one of them!
If I'm seeing correctly it's the FN key on split right shift that's not working? The pin on that switch with the jumper attached should actually be connected to the pin below diode D64 - the middle three switch positions all connect to D69 on their top pins but the two end positions have their own diode, and it switches pin. As you're connecting it before the diode it will be a good fix - assuming it works. if D69 has died it still won't work and you'll need to replace/bypass it...